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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Red blood cells transport oxygen to cells throughout your body, giving you the energy you need. The symptoms: Iron deficiency anemia causes extreme fatigue, weakness, and pale skin. You may also notice headaches, difficulty concentrating, cold hands and feet, and hair loss.